Crosshead wrist-pin fob locomotives



H. A. HOKE.

CROSSHEAD WRIST PIN FOR LOCOMOTIVES.

APPLICATION FILED FEB. 26.1919.

1,312,987. Patented .12,1919.

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CROSSHEAD WRIST-PIN FOR LOCOMOTIVES.

Specification of Letters Patent.

Applioation filer i February 26, 19 19. Serial No. 279,240.

To all whom it mayconcern:

Beit known that LHARRY Hoxn, a

citizen of the United States, and residing V when desired; ,It particularlyrelates to, loa .comotives, where the-side of the cross head which faces outwardly .is easily accessible while .the other face is in close proximity V such dlameter thatthe Wr st pin freely passes to the driving wheel and other mechanism. of the locomotive. sirable to insert the wrist-pin from the front of the cross headfandto remove it inthe same manner, thus avoiding shiftingv the; engine back andforth until the wrist pin can be inserted or driven out between the spokes of the driving wheel, as must be done in nearly everycase where the wrist pin is applied and removed from the backor inside of the crosshead.

Another obj ect. of the invention is to pro erful pull on the wrist pin to withdraw the same when it is desired to disconect the connecting rod, thus avoiding the useof special tools, or avoiding thenecessity of The invention will be fully disclosed in the following description when taken. in connection with the accompanying drawings a in which Figure 1 is a side elevation of a cross head proved wrist pin connection incorporated therewith;

Fig. 2is

a section along the line 2&2 of

Fig. 3 is a view similar to Fig. 2 part broken away and showing some of the ele ments in position to extract the pm from the cross head;

. Fig. 4 is a longitudinal section of a modi fied formof wrist pin connection;

Fig. 5 is a view similar to Fig. 4 with part broken away and showing the mechanism for extracting the pin in this modification,

The cross head comprises essentially a In such cases it is de singlepiece having the usual piston rod re? ceiving sleeve 10 and 'the inner and-outer vertical walls 11 and 12 to thehorizontal upper and lower edges of which the bearing shoes are adapted to be bolted or otherwise secured. The inner and outer walls 11 and12 are provided with axially alined ta- Patented Aug. 12, 1919.

V pering "openings 13 and 14' respectively 1 I adapted to receive with a close fit similarly tapering bearing surfaces on the wrist pin a 15 which is adapted to be inserted into the cross head from the outside, that is, from the side facing away from the driving wheels or other machinery. Extending out- Wardly from the outer wall is a boss 1,6'exv ternally threaded at 1'1 and having a cylindrical opening therethrough axially alined withthe tapering openings 13 and l4 and of through when. being inserted into the cross head or 'withdrawn therefrom. Mounted onythelboss 16 is an internally threaded annular member 18, the threaded portion offwhich engages the thread 17 of the boss 16 and which has a portion 19 adapted to engage the annular surface 20 of the wrist pin .15; and to force the wristgpin to seat in the openings 13 and 14 and to hold it in such position, Whenthe annular member is turned in the-proper direction.

Extending outwardly from the body mainpor-tion of the wrist pin 15 is a hollow shank 21 externally threaded at 22 and, 23; to receive the lock nuts 24. and 25, 25,

respectively. The threads 23 maybe of any ways of; .a .pitchqsomewhat less 7 than the or forcing nut 18 is held inits locking position by the three lock nuts 24, and .25, 25, re-

spectively, and when the same are tightened it is impossible for the member 18 to become loose and release the Wrist pin.

To remove the wrist pin it is only necessary to remove the lock nuts 25, 25, the

washer 26, cross head link 27, and then to. gsimultaneous'ly rotateor unscrew the annular member ,18 and the lock nut 24. As the threads 17 and 22 run in the same direction, the annular member 18 will tend to turn oif convenient pitch but thethreads 22 are al- ,of the boss 16 and the lock nut 24 ofi' .ofthe I ing nut 18.

threaded portion 220i the shank 21. Ass,

suming that the thread 17 has a pitch. of 8 per inch while the threads 22 have a pitch of 10 per inch, it is readily seen that when both the member 18 and the nut 24 are rotated. simultaneously through one revolution, the. member 18 will have traveled g of an inch outwardly along the boss 16- and the lock nut 24 will have traveled of an inch outwardly along the shank21. The Wrist pin l5has, therefore, been Withdrawn from thecross head a distance equal to minus of an inch, or a distance equal to .025 of one inch. In this manner a moderate rotative force exerted on the nuts 18 and 24: exerts a very powerful pulling force on the wrist pin 15 because Y of the difl'erential action of the threads, and the wrist pin may bewithdrawn from the cross head no matter how tightly it has become jammed, without the use of special tools or by hammering.

In Fig. 3 the parts are shown in position for extracting'the pin in the manner above described.

The wrist pin is made hollow to cut down weight and to provide an internal lubricating means for the connecting rod bearing. I have illustrated a well known means of lubricating the cylindrical portion 28 of thewrist' pin, which comprises radial grease or oil holes 29, 29, a hollow casting 30 threaded in the interior of the wrist pin, a

threaded grease cup plunger 31 in the hollow shank 21 of the wrist pin, and a lock nut 32 therefor. The hollow casting 30 simply does away with the necessity of having a large amount of grease and the grease cup plunger 3l is of the usual type, being ad justed from the outside from time to time tofor'ce' grease contained within the wrist pin radially outward through the openings 29011 to the bearing surface 28. The lubricatingmeans just described is not a part of myinvention and is not claimed.

In Figs. 4 and '5 I have illustrated a modified form of my invention in which the boss l6cis' interiorly threaded and the annular member or forcing nut'l8 is exteriorly' threaded to correspond. In addition, the lock nut 24 bears on the end of the boss 16 instead of on the annular member or forc The remainder of the construction is substantially the same as in the preferred form. It will be noted that in the modification the shank 21 of the wrist pin is eXterior'ly threaded at 22 although when the wrist pin is in its locked position this thread has no function. An inspection of Fig. 5, however, shows that the threaded portion 22 of the shank 21 is adapted to receive the internally threaded portion of a puller nut 35 which is adapted to bear against the outer end of the annular boss 16. When it is desired to remove the wrist pin, the lock nuts, cross head link, and

washer are removed, as well as the annular member or forcing nut 18. The puller nut 35 is then screwed on the shank of the Wrist pin and by continuing to rotate the same after it has abutted against the an.- ular end of boss 16, it is apparent that the wrist pin will be withdrawn from its seat by the nut 35 acting with great mechanical advantage.

From the above description-it is apparent that the wrist pin of the improved cross head may beeasi'ly inserted from the outside, thus avoiding allinconvenience due to the proximity of the machinery parts, and is securely held in these seats by a plurality of lock nuts which absolutely prevent its aocidental movement, and may be quickly removed no matter how tightly ammed.

Having thus described my invention what I claim as new and desire to secure by Let'- ters Patent is clearly pointed out in the appended claims: v

1. Ina cross head for locomotives, the combination with the inner wall having an opening therein and the outer wall having on itsouter side an externally threaded boss with an opening therethrough, of a wrist pin fitting said openings and an annular member having an internally threaded portion to engage the thread on said boss, and a portion to engage and lock said pin in said openings.

2; In a cross head for locomotives, the combination with theinner wall having an opening therein and the outer wall having on its outer side an exteri'ially threaded boss with an opening therethrough, of a wrist pin fitting said openings and having an externally threaded shank extending outwardly pastthe outer wall and an annular bearing surface around said shank, an annular member having an internally threaded portion to engage the thread on said boss and a portion to engage the annular bearing surface on the pin'and lock said pin in said 110 openings, and an internally threaded nut mounted on said threaded shank and bearing on said annular member to lock the same in position.

3. In a. cross head for locomotives,- the 11 combination with the inner wall having an opening therein and the outer wall having on its outer side an externally threadedboss with an opening therethrough, of a wrist pin fitting said openings and having an e'X- 120 look said annular member when turned in one direction, and to cooperate with said annular member to slowly Withdraw the pin from said openings when both are turned together in the other direction, by the differential action of said threads.

4. In a cross head for locomotives, the combination with the inner and outer Walls,

having alined openings therein and a Wrist pin fitting said openings and having an ex- 10 teriorly threaded shank projecting beyond said outer Wall, of means for holding said WIiSl', pin seated in said openings, and a threaded member adapted to cooperate with the threaded shank and said outer Wall to 15 remove said pin.

In testimony whereof I aflix my signature,

HARRY A. HOKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

